221000212022221 has 4 divisors (see below), whose sum is σ = 228129251119744. Its totient is φ = 213871172924700.

The previous prime is 221000212022203. The next prime is 221000212022231. The reversal of 221000212022221 is 122220212000122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221000212022221 - 2¹⁷ = 221000211891149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221000212022231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3564519548715 + ... + 3564519548776.

It is an arithmetic number, because the mean of its divisors is an integer number (57032312779936).

Almost surely, 2^{221000212022221} is an apocalyptic number.

It is an amenable number.

221000212022221 is a deficient number, since it is larger than the sum of its proper divisors (7129039097523).

221000212022221 is an equidigital number, since it uses as much as digits as its factorization.

221000212022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7129039097522.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 221000212022221 its reverse (122220212000122), we get a palindrome (343220424022343).

The spelling of 221000212022221 in words is "two hundred twenty-one trillion, two hundred twelve million, twenty-two thousand, two hundred twenty-one".